After #Alexa+ one too many times picked arguments about whether a light was, indeed, on I tried to bring home automation out of the cloud by migrating to #OpenHA.
I do appreciate how much thought went into the design of the system, but seriously, if your getting started guide even uses the words semantic and ontology, you need to reconsider. If it requires study of those two topics, it's gone off the rails.
Such philosophical depth should not be a prerequisite for basic operation of the ceiling light.